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Employee Benefit Plans (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2016
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
$ / shares
Mar. 31, 2017
USD ($)
Performance Shares [Member] | November Two Thousand Sixteen Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs granted in the period 330,000    
Award vesting period 3 years    
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares $ 29.20    
Compensation expense | $   $ 1.1 $ 2.0
Performance Shares [Member] | November Two Thousand Sixteen Grant [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of total units granted that vest in the period 0.00%    
Performance Shares [Member] | November Two Thousand Sixteen Grant [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of total units granted that vest in the period 200.00%    
Restricted Stock Units (RSUs) [Member] | November Two Thousand Sixteen Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs granted in the period 30,000    
Award vesting period 3 years    
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares $ 27.61    
Restricted Stock Units (RSUs) [Member] | Fiscal 2017 Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs granted in the period   1,800,000  
RSU Grant Recipients   600  
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares   $ 28.65  
Compensation expense | $   $ 4.2 $ 4.2
Restricted Stock Units (RSUs) [Member] | Fiscal 2017 Grant [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   3 years  
Restricted Stock Units (RSUs) [Member] | Fiscal 2017 Grant [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   5 years